Agreed. Times when I was afraid to tell other people about something I was working on/wanted to achieve were the same times as when it/I wasn't good enough.
This made me think of it a little differently. You know, I've never regretted not telling the whole my ideas but I could think of many examples where I would regret it, if I had. In fact, it seems very odd anyone would regret not telling everyone, including all of your potential big name competitors, your ideas. You'd have to be really wrapped in that meme :)